Meryl Streep

Florence Foster Jenkins

Hugh Grant

St. Clair Bayfield

Simon Helberg

Cosmé McMoon

Rebecca Ferguson

Kathleen Weatherley

Nina Arianda

Agnes Stark

Stanley Townsend

Phineas Stark

Allan Corduner

John Totten

Christian McKay

Earl Wilson

David Haig

Carlo Edwards

John Sessions

Dr. Hermann

Brid Brennan

Kitty

John Kavanagh

Arturo Toscanini

Pat Starr

Mrs. Vanderbilt

Maggie Steed

Mrs. James O'Flaherty

Thelma Barlow

Mrs. Oscar Garmunder

Liza Ross

Mrs. EE Patterson

Paola Dionisotti

Baroness Le Feyre

Rhoda Lewis

Mrs. Patsy Snow

Aida Garifullina

Lily Pons

David Mills

Augustus Corbin

David Menkin

Carlton Smith

Sid Phoenix

Corporal Jones

Tunji Kasim

Private Smith

Carl Davis

Orlando Adams

Lloyd Hutchinson

Microphone Engineer

Richard Kilgour

Elevator Operator

Jonathan Plowright

Ernest Ziegler

Josh O'Connor

Donaghy

Brian Fisher

Finkler

Stefan Bednarczyk

Stephen Foster

Nathan Osgood

Stagehand

Caolan Byrne

Stagehand 2

John Guerrasio

Newspaper Vendor

Ewan Stewart

Colonel

Greg Lockett

Chuck

Cameron Cuffe

Gino

Georgina Morton

Pearl

James Sobol Kelly

Edgar (Diner)

Dar Dash

Antonio

Grant Gillespie

Brooklyn Man

Nat Luurtsema

Tallulah Bankhead

Philip Rosch

Archie the Doorman

Elliot Levey

Edgar Booth Cunningham, Jr.

Danny Mahoney

Clifford B. Thornton III

Simon Markson

Piano Tuner

Mark Arnold

Cole Porter

Adele Smyth-Kennedy

Wag Woman

Jenny Hawkins

Florence's Dresser

Hallam Rice-Edwards

Corbin's Gang

Victory Maburutse

Corbin's Gang

Rosy Benjamin

Corbin's Gang

Oliver King

Corbin's Gang

James Wallace

Corbin's Gang

Charles Streeter

Corbin's Gang

Andrew Sloane

Corbin's Gang

Madeleine Knight

Corbin's Gang

Stephanie Lane

Corbin's Gang

Philip Gascoyne

New York Journalist (uncredited)